<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 警告区域 -->
            <el-alert
                title="注意：只允许为第三级分类设置相关参数！"
                type="warning" :closable="false" show-icon>
            </el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <el-cascader
                        v-model="selectedCateKeys"
                        :options="cateList"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col>
            </el-row>

            <!--  tab 页签 区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini"
                                type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini"
                                type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini"
                                type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini"
                                type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
            <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClosed">
            <el-form ref="editFormRef" :model="editForm" :rules="editFormRules" label-width="80px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data () {
        return {
            // 商品分类列表
            cateList: [],
            // 级联选择框的配置对象
            cateProps: {
                // checkStrictly: true,
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的也标签的名称
            activeName: 'many',
            // 动态属性的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 修改参数对话框的显示与隐藏
            editDialogVisible: false,
            // 修改表单的数据对象
            editForm: {
                attr_name: '',
                attr_id: ''
            },
            // 修改表单的验证规则对象
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            }
        }
    },
    created () {
        this.getCateList()
    },
    methods: {
        async getCateList () {
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }
            this.cateList = res.data
        },
        // 级联选择框变化会触发此函数
        handleChange () {
            this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleTabClick () {
            console.log(this.activeName)
            this.getParamsData()
        },
        // 获取参数列表数据
        async getParamsData () {
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            console.log(this.selectedCateKeys)
            // 根据所选id和 当前所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败！')
            }

            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
            })

            console.log(res.data)
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            } else {
                this.onlyTableData = res.data
            }
        },
        // 监听对话框的关闭事件
        addDialogClosed () {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams () {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
                if (res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击按钮，显示编辑的对话框
        async showEditDialog (attrid) {
            // 查询当前参数的信息
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrid}`, { param: { attr_sel: this.activeName } })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed () {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮 修改参数信息
        editParams () {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })

                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败！')
                }

                this.$message.success('修改参数失成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据 id 删除对应的参数项
        async removeParams (attrid) {
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)

            // 用户取消删除操作
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除！')
            }

            // 删除的业务逻辑
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrid}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }

            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 文本框失去焦点或按下了 enter 键都会触发
        async handleInputConfirm (row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有retrn 则证明输入的内容， 需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求， 保存这次操作
            this.saveAttrVals(row)
        },
        async saveAttrVals (row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数失败！')
            }
            this.$message.success('修改参数成功！')
        },
        // 点击按钮展示 文本输入框
        showInput (row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 作用： 当页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus()
            })
        },
        // 删除对应的参数可选项
        handleClose (i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 如果按钮需要被禁用，返回true，否则返回false
        isBtnDisabled () {
            if (this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId () {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText () {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0px;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
    margin-left: 10px;
}
</style>
